On Sun, 2012-12-30 at 16:13 -0700, Ian Lepore wrote: > On Wed, 2012-12-26 at 21:24 +0200, Alexander Motin wrote: > >[...] > > > > I grabbed testsleep.c to test an arm event timer implementation, and had > to fix a couple nits... kqueueto was missing from the names[] array, and > I had to add a "* 1000" to a couple places where usec was stuffed into a > timespec's tv_nsec. > > I also tested the calloutng_12_17 patches and the kqueue stuff behaved > very strangely. Then I noticed you had a 12_26 patchset so I tested > that (after crudely fixing a couple uninitialized var warnings), and it > all looks good on this arm (Raspberry Pi). I'll attach the results. > > It's so sweet to be able to do precision sleeps. > > -- Ian > > > plain text document attachment (calloutng_test.txt) > for t in 1 300 3000 30000 300000 ; do > for m in select poll usleep nanosleep kqueue kqueueto syscall ; do > ./testsleep $t $m > done > done > > > With calloutng_12_26.patch... > > HZ=100 HZ=250 HZ=1000 > ---------- ---------------- ---------------- ---------------- > select 1 55.79 1 50.96 1 61.32 > poll 1 1109.46 1 1107.86 1 1114.38 > usleep 1 56.33 1 72.90 1 62.78 > nanosleep 1 52.66 1 55.23 1 64.23 > kqueue 1 1114.23 1 1113.81 1 1121.21 > kqueueto 1 65.44 1 71.00 1 75.01 > syscall 1 4.70 1 4.45 1 4.55 > select 300 355.79 300 357.76 300 362.35 > poll 300 1107.85 300 1122.55 300 1115.62 > usleep 300 355.28 300 357.28 300 360.79 > nanosleep 300 354.49 300 355.82 300 360.62 > kqueue 300 1112.57 300 1118.13 300 1117.16 > kqueueto 300 375.98 300 378.62 300 395.61 > syscall 300 4.41 300 4.45 300 4.54 > select 3000 3246.75 3000 3246.74 3000 3252.72 > poll 3000 3238.10 3000 3229.12 3000 3250.10 > usleep 3000 3242.47 3000 3237.06 3000 3249.61 > nanosleep 3000 3238.79 3000 3231.55 3000 3248.11 > kqueue 3000 3240.01 3000 3236.07 3000 3247.60 > kqueueto 3000 3265.36 3000 3267.22 3000 3274.96 > syscall 3000 4.69 3000 4.44 3000 4.50 > select 30000 31714.60 30000 31941.17 30000 32467.69 > poll 30000 31522.76 30000 31983.00 30000 32497.81 > usleep 30000 31459.67 30000 31980.76 30000 32458.71 > nanosleep 30000 31431.02 30000 31982.22 30000 32525.20 > kqueue 30000 31466.75 30000 31873.90 30000 31973.54 > kqueueto 30000 31564.67 30000 32522.35 30000 32475.59 > syscall 30000 4.70 30000 4.73 30000 4.89 > select 300000 319133.02 300000 311562.33 300000 309918.62 > poll 300000 319604.27 300000 311422.94 300000 310000.76 > usleep 300000 319314.60 300000 311269.69 300000 309996.34 > nanosleep 300000 319497.58 300000 311425.40 300000 309997.13 > kqueue 300000 309995.55 300000 303980.27 300000 309908.82 > kqueueto 300000 319505.88 300000 311424.97 300000 309996.16 > syscall 300000 4.41 300000 4.45 300000 4.89 > > > With no patches... > > HZ=100 HZ=250 HZ=1000 > ---------- ---------------- ---------------- ---------------- > select 1 19941.70 1 7989.10 1 1999.16 > poll 1 19904.61 1 7987.32 1 1999.78 > usleep 1 19904.95 1 7993.30 1 1999.96 > nanosleep 1 19905.64 1 7993.71 1 1999.72 > kqueue 1 10001.61 1 4004.00 1 1000.27 > kqueueto 1 19904.00 1 7993.03 1 1999.54 > syscall 1 4.04 1 4.05 1 4.75 > select 300 19904.66 300 7998.39 300 2000.27 > poll 300 19904.35 300 7993.47 300 1999.86 > usleep 300 19903.96 300 7994.11 300 1999.81 > nanosleep 300 19904.48 300 7993.77 300 1999.80 > kqueue 300 10001.68 300 4004.18 300 1000.31 > kqueueto 300 19997.86 300 7993.37 300 1999.59 > syscall 300 4.01 300 4.00 300 4.32 > select 3000 19904.80 3000 7998.85 3000 3998.43 > poll 3000 19904.92 3000 8005.93 3000 3999.39 > usleep 3000 19904.50 3000 7992.88 3000 3999.44 > nanosleep 3000 19904.84 3000 7993.34 3000 3999.36 > kqueue 3000 10001.58 3000 4003.97 3000 3000.72 > kqueueto 3000 19903.56 3000 7993.24 3000 3999.34 > syscall 3000 4.02 3000 4.37 3000 4.29 > select 30000 39905.02 30000 35991.79 30000 31051.77 > poll 30000 39905.49 30000 35980.35 30000 30995.64 > usleep 30000 39903.78 30000 35979.48 30000 30995.23 > nanosleep 30000 39904.55 30000 35981.61 30000 30995.87 > kqueue 30000 30002.73 30000 32019.54 30000 30004.83 > kqueueto 30000 39903.59 30000 35979.64 30000 30996.05 > syscall 30000 4.44 30000 4.04 30000 4.31 > select 300000 310001.23 300000 303995.86 300000 300994.30 > poll 300000 309902.73 300000 303981.58 300000 300996.17 > usleep 300000 309903.64 300000 303980.17 300000 300997.42 > nanosleep 300000 309903.32 300000 303980.36 300000 300993.64 > kqueue 300000 300002.77 300000 300019.46 300000 300006.90 > kqueueto 300000 309903.31 300000 303978.10 300000 300996.84 > syscall 300000 4.01 300000 4.04 300000 4.29 Davide asked me in a private followup (long ago) to try the same test with linux running on the same hardware. I finally got around to downloading a linux image for the Raspberry Pi today and did so. The image I used was 2012-12-16-wheezy-raspbian.zip SHA-1 514974a5fcbbbea02151d79a715741c2159d4b0a The test code was the same as last time, except for commenting out the kqueue stuff. Here are the results... 1 79.80 select 1 1077.37 poll 1 74.87 usleep 1 74.83 nanosleep 1 0.00 <no linux kqueue> 1 0.00 <no linux kqueue> 1 0.87 syscall 300 379.89 select 300 1077.70 poll 300 374.97 usleep 300 374.75 nanosleep 300 0.00 <no linux kqueue> 300 0.00 <no linux kqueue> 300 0.85 syscall 3000 3085.27 select 3000 3081.32 poll 3000 3081.20 usleep 3000 3081.06 nanosleep 3000 0.00 <no linux kqueue> 3000 0.00 <no linux kqueue> 3000 0.88 syscall 30000 30093.14 select 30000 30090.79 poll 30000 30090.05 usleep 30000 30088.43 nanosleep 30000 0.00 <no linux kqueue> 30000 0.00 <no linux kqueue> 30000 0.86 syscall 300000 300351.35 select 300000 300346.16 poll 300000 300097.34 usleep 300000 300097.29 nanosleep 300000 0.00 <no linux kqueue> 300000 0.00 <no linux kqueue> 300000 0.85 syscall -- IanReceived on Thu Jan 17 2013 - 15:05:51 UTC
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